<?php echo link_to(
                image_tag(
                    'script.png'
                    , array(
                        'style' => 'margin-right: 5px;'
                        , 'border' => 0
                        , 'alt' => __('Set label')
                        , 'title' => __('Set label')
                    )
                )
                , 'tree/label?id=' . $tree->getId()
            ) ?>
<span style='color: darkgreen;'><?php echo strtoupper($tree->getLabel()) ?></span>